Nitro car old tire strategy - Hemi Truck Club
 
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Old 05-24-2012, 06:56 AM   #1
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Interesting. I had never thought of this and had never heard of it until this article. And I thought this old gearhead had heard it all. Old tires stretch easier and grow taller during the run than new tires do.
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"We do that all the time,” Hight said Tuesday in a phone interview. “There are several reasons (why they use old tires sometimes). Everybody plays that game. When it is hot, you need more traction. For one thing, the tire will be a little bigger to the stretch, so the gear ratio will be higher and it has better grip. When it is cool and the track is really tight you want a little extra drive shaft speed and a little extra wheel slip, so you put new tires on it (the car), and they are smaller diameter so it is a lower gear ratio.”

Hight said under Sunday’s first-round circumstances at Topeka, changing to used tires was the right choice.

“We were the eighth pair, the last pair, and it was heating up quick,” Hight said. “Let’s say we would have run at 11 a.m. when the first pair of Top Fuel was. Without a doubt we would have had new tires on it (Hight’s Funny Car). The track probably heated up 10 degrees from then (the first pair of Top Fuel) until I ran being the last pair of Funny Car.”

Hight added switching from new tires to old tires and vice verse is a common practice for competitors in Funny Car and Top Fuel.

“About every contender out there does the same thing,” Hight said. “Alan Johnson takes it to extremes and takes new and used tires to the staging lanes on a golf cart. We usually just stay back at our pit until we absolutely have to make the call and Jimmy (Prock, Hight’s crew chief) makes the call and we put on tires accordingly and roll up there. It’s a big part of it (choosing what tire to use). The clutch and the tire size (the diameter of the tire), new vs. used, and what we use is all based on track temp.
http://www.competitionplus.com...n-topeka-nothing-new."

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Old 05-24-2012, 06:56 AM   #2
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Interesting. I had never thought of this and had never heard of it until this article. And I thought this old gearhead had heard it all. Old tires stretch easier and grow taller during the run than new tires do.
Quote:
"We do that all the time,” Hight said Tuesday in a phone interview. “There are several reasons (why they use old tires sometimes). Everybody plays that game. When it is hot, you need more traction. For one thing, the tire will be a little bigger to the stretch, so the gear ratio will be higher and it has better grip. When it is cool and the track is really tight you want a little extra drive shaft speed and a little extra wheel slip, so you put new tires on it (the car), and they are smaller diameter so it is a lower gear ratio.”

Hight said under Sunday’s first-round circumstances at Topeka, changing to used tires was the right choice.

“We were the eighth pair, the last pair, and it was heating up quick,” Hight said. “Let’s say we would have run at 11 a.m. when the first pair of Top Fuel was. Without a doubt we would have had new tires on it (Hight’s Funny Car). The track probably heated up 10 degrees from then (the first pair of Top Fuel) until I ran being the last pair of Funny Car.”

Hight added switching from new tires to old tires and vice verse is a common practice for competitors in Funny Car and Top Fuel.

“About every contender out there does the same thing,” Hight said. “Alan Johnson takes it to extremes and takes new and used tires to the staging lanes on a golf cart. We usually just stay back at our pit until we absolutely have to make the call and Jimmy (Prock, Hight’s crew chief) makes the call and we put on tires accordingly and roll up there. It’s a big part of it (choosing what tire to use). The clutch and the tire size (the diameter of the tire), new vs. used, and what we use is all based on track temp.
http://www.competitionplus.com...n-topeka-nothing-new."
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Old 05-29-2012, 08:42 AM   #3
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Ya learn something new every day. Good read!
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Old 05-30-2012, 05:29 AM   #4
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Old 06-06-2012, 02:06 PM   #5
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Didn't know this. I thought they spent so much effort dialing the clutch I wouldn't think they would make any last minute changes that might upset the settings.
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